Valve mechanism for locomotives.



PATENTED DEC. zo, 1904.

J. B. BARNES. VALVE MEGHANISM FOR LOGOMOTIVES.

APPLIUATION FILED AUG. 2. 1904.

NO MODEL.

Patented December 20, 1904.

PATENT OEEICE.

JOSHUA BARTLETT BARNES, OF SPRINGFIELD, ILLINOIS.

VALVE MECHANISNI FOR LOCOIVIOTIVES.l

SPECIFICATION forming part of Letters Patent. No. 777 ,933, datedDecember 20, 1904.

Application filed August 2, 19,04. Serial No, 219,235.

T all whom it 11mg/ concern,.-

. provide a device which will prevent the forming of a vacuum in thecylinders when the throttle-valve is closed to cut off the steam and theengine is drifting, thus eliminating the retarding effect on the pistonsand the resulting wear and tear on the machinery.

A further object is to relieve the vacuum in the'dry pipe, thuspreventing the collapse thereof.

A further object is to provide for the maintaining of the normal thermalcondition of the cylinders and passages and the reduction ofcondensation.

Other objects are lto prevent induction =of smoke, cinders, and hotgases through the exhaust-pipe and to render unnecessary the applicationof overpass and relief valves.

Vith these objects in view the invention includes the features ofconstruction and arrangement of parts hereinafter described, andparticularly pointed out in the claims.

The invention is illustrated in the accompanying drawings, in which-Figure l shows a part longitudinal vertical section of a locomotiveboiler, and Fig. 2 a part rear elevation.

In the drawings, M designates the ordinary steam-dome, from the upperportion of which the dry pipe H conveys the steam to the cylinders inthe ordinary manner, the passage of the steam being controlled by athrottle-valve H', operated through suitable connections, such asbell-crank lever A and rod A. A pipe O'also leads from the upper part ofthe dome rearward through the upper portion of the boiler, where itconnects with a steamfountain D, a valve L being provided by which thepassage of steam from the pipe O to the steam-fountain or auxiliary domemay be controlled. From the steam-fountain D a pipe J leads downwardinto va convenient position for the engineer, where it connects with thepipe B, which extends forward through the boiler and up into the drypipe H at the point indicated at G. At the point where the pipes J and Bjoin a cut-off valve F may be operated by a suitable handle F and anadditional controlling-valve may be provided, as shown at E. i

In the operation of the arrangement above described it will be seen thatsteam will enter the pipe O from the dome M and pass through the valve Linto the fountain D. The valve E. is open sufficiently to admit theproper amount of steam to the pipe J. After the engine is started thevalve F is opened and left in its open position until the engine isstopped for any considerable length of time. Steam thus passes throughthe valve F, pipe B, and connection G into the pipe H, and thence to thecylinders in the usual manner. The result of this is that when thethrottlevalve is closed and the engine is drifting a small amount ofsteam is admitted to the cylinders, the amount of which may of course beregulated by the valve E. This prevents vents avacuum in the cylindersand eliminates the consequent retarding effect on the pistons and theresultant wear and tear on the machinery. It relieves the vacuum in thedry pipe, thus preventing all danger of the collapse thereof. Itmaintains the normal thermal condition of the cylinders and passages andreduces condensation. It prevents the induction of smoke, cinders, andhot gases through the exhaust-pipe, thereby reducing the wear on thevalves and cylinders andA protecting the lubrication. It rendersunnecessary the application of overpass and relief valves, therebysaving expense of application and maintenance and preventing theentrance of cold air to the cylinders, and, finally, it

provides means by which the engine may be moved in case of accident tothe throttle valve or connections, as by opening the valve E widesniiicient steam can be admitted to the cylinders to move the engine.

Though I have described it as desirable to take steam from thesteam-fountain on top of boiler by the valve marked E, I do not IOO und

limit myself to this particular arrangement. This valve can be tappedinto the boiler at any other point where dry steam can be procuredindependently altogether of the fountain D and its dry-pipe connectionsC C running to the dome. The fountain and this pipe are merely forconvenience, as any connection can be made that will furnish dry steamto the valve E from the dome.

Having thus described my invention, what I claim is- 1. In an engine,the combination with the throttle-Valve and dry pipe, of means forpreventing the formation of avacuum in the drypipe and cylinders,consisting of an independent valve having means for holding the same inany desired position, substantially as described.

2. In an engine, the combination with the steam-dome dry pipe andthrottle-valve and steam-fountain connected to the steam-dome,

of a pipe connection between the steam-fountain and dry pipe, and avalve having operating means within reach of the engineer forcontrolling the passage of steam through said Valve, substantially asdescribed.

3. In an engine, the combination with the steam-dome dry pipe andthrottle-valve and the steam-fountain connected to the steamdome, of apipe connection from the steamfountain to the dry pipe, aregulating-Valve controlling the passage or' steam from steamfountain tosaid pipe connection, and a cutotf valve in said pipe connectionoperated by connection located within reach of Athe engineer,substantially as described.

In testimony whereof I aiX my signature in presence o1 two witnesses.

JOSHUA BARTLETT BARNES.

Witnesses:

ALONZO B. MARS, E. R. JEFFERY.

